15 February 1993 Application of off-axis holography to spray investigations: aberration minimization and size determination
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Abstract
A holographic measurement system was used for the investigation of droplet size, density and velocity in the injection spray of a model diesel engine. The model engine consisted of a conventional injection pump and a test chamber that could be operated at high pressure and temperature to simulate the conditions in an operating diesel engine. The use of off-axis holography with a laser light sheet from a pulsed ruby laser helped to increase the maximum droplet density in the spray that could be resolved. Chromatic aberrations, introduced by the reconstruction of the holograms with a wavelength different from the recording wavelength, were minimized by careful choice of recording and reconstruction geometry. A new method for size determination was devised. The reconstructed images were recorded with a CCD camera and analyzed with the help of a personal computer. Software for automatic detection of 3-D particle position and velocity determination was developed.
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Johannes K. Schaller, Andreas Ante, Thilo Theisen, Christo G. Stojanoff, "Application of off-axis holography to spray investigations: aberration minimization and size determination", Proc. SPIE 1756, Interferometry: Applications, (15 February 1993); doi: 10.1117/12.140809; https://doi.org/10.1117/12.140809
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